Metal-working machine



W. H. BRADLEY. METAL WORKING MACHINE.

APPLICATION FILED JAN-2. 1920.

' 1,390,978. PatentedSept. 20,1921.

7SHEETSSHEET I.

W. H. B RADLEY.

METAL WORKING MACHINE.

APPLICATION FILED mnz. 1920.

1,390,978. Patentedsept- 20,1921.

ISHEETS-SHEET 2.

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PatentedSept. 20, 1921.

W. H. BRADLEY.

METAL WURKING MACHINE. APPLICATION FILED JAN-2. i920.

@l Z N 8 r 3 m L w W. H. BRADLEY.

METAL WORKING MACHINE.

APPLICATION FILED JAN-2,1920.

1,390,978. PatentedSept. 20,1921.

7SHEETSSHEET 4.

W. H. BRADLEY.

METAL WORKING MACHINE.

APPLICATION FILED JAN-2,1920.

Patented Sept. 20, 1921.

ISHEETS-SHEET 5- a b v v Q W. H. BRADLEY.

METAL WORKING MACHINE.

APPLICATION FILED JAN-2. 1920.

Patented Sept. 20, 1921.

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W. H. BRADLEY.

METAL WORKING MACHINE.

APPLICATION FILED JAN-2, 1920.

1,390,978. PatentedSept. 20, 1921.

TSHEETS-SHEET 7- J33 $5 irl UNITED STATES PATENT orrlce.

WILLIAM HOY BRADLEY OF SPRINOFIELD, OHIO, ASSIGNOR TO THE AUTOMATIC METAL PRODUCTS COMPANY, OF SPRINGFIELD, OHIO, A. CORPORATION OF OHIO.

unrnrwonxme uacnmr.

Patented Sept. 20, 19.21.

Application filed January 2, 1920. Serial No. 348,887.

To all whom it may concern:

Be it known that I, WILLIAM HOY BRAD- LEY, citizen of the United States, residing at Springfield, in the county of- Clark and State of Ohio, have invented certain new and useful Improvements in Metal-Working Machines, of which the following is a specification.

This invention relates to improvements in metal working machmes, 1t more partlcu- I larly relating to a machine of an automatic character for forming nut blanks from bars of stock.

One of the objects of the invention is to provide a machine of this character equipped with a -plurality of nut blank forming and stock feeding devices so that a plurality of blanks may be simultaneously formed at a single operation.

A further object of the invention is to provide improved gripping devices for the stock during the drilling and severing operations and for releasing said gripping devicelsI during the feeding operation of the stoc A further object of the invention: is to provide improved cutting mechanism. for

severing the blanks from the bars of stock.

A further object of the invention is to provide feeding devices of an improved character for automatically feedin the stock after the completion of the nutlank. A further object of my invention is to provide means for preventing the operation of the feeding devices until after the severing tools have completed their operation and been withdraw-n from, operative. position.

A further object of my invention is to simplify the construction and make more effective the operation ofmachines of this character.

Further objects of the invention will appear from the/accompanying drawings and specification.

In the drawings:

Figure l is a side elevation of the front of a machine embodying the improvements.

Fig. 6 is a vertical section on the line 6-6 of Fig. 1, with the drills and some of the other parts omitted.

Fig. 7 is a view of the front end of the machine.

Fig. 8 is a rear side view of a portion of the machine. 1

Fig. 9 is a section on the line 9-9 of Fig. 3.1

ig. 10 is a section on the line 10-10 of Fig. 3.

Fig. 11 is a section on the line 11-11'of Fig. 9. k I

Fig. 12 is a longitudinal section of one of the stock holding spindles and some of the parts associated therewith.

F 13 is a plan'view of a portion of the same.

Fig. 14 is aii end view of the same. 1 Fig. 15 is an end View of the spindle colars.

Fig. 16 is a side view of the same.

Fig. 17 is an end view of one of the dog collars.

Fig. 18 is a side view of the same.

Fig. 20 is an end view of the same.

Fig. 21 is a longitudinal section of one of the .drill spindles and parts associated gierewith, the figure being a continuation of Figs 22 to 27 inclusive are details of the drill spindle locking device.

Fig. 28 is a vertical section through the stock mandrels, and gripping and feeding devices therefor, the section being on the line 28-28 of Fig. 2 with some of the parts omitted.

Fig. 29 is a detail of some of the operating devices for the drills.

Referring to the drawings, 1 represents a supporting frame resting upon legs 2, 3 is a head stationarily mounted on the frame, and 4 is another head slidably mounted on the frame. This frame and the two heads serve to support and house all of. the operating parts. Power is applied to the different mechanisms through a main drive shaft 5 and its pulley 6, this shaft'being geared to the stock carrying mandrels andthe drills in the manner to be described, and also has a connection to a cam shaft 7 through a pinion -8 and gear 9, inclosed in a housing (shown in dotted lines in Fig. 1) and change of speed gearing (not shown) be- 80 Fig. 19 isa side of the stock feed finger.

tween the said pinion and gear. A plurality of stock gripping, rotating and feeding devices are employed, as well as a plurality of drills and cutters for the stock, four sets of these devices being shown in the present machine.

Stock gripping and rotating devices.

Inasmuch as all sets of these devices are constructed exactly alike, but one of them will be described in detail, reference being had more particularly to Figs. 1, 2, 12, 13, 14, 15,16, 17 and 18. These devices are mounted in the stationary head 3 in uniform manner about the drive shaft 5, which is rotatably mounted, not only in the heads 3 and 4, but in bearings on the supporting bed 1. Referring to Fig. 12, 10 represents a mandrel having an outwardly flared or conicalshaped inner end 10, the mandrel being journaled in bushings 11 and 12 in the bearings 13 and 14 of the head 3. Slidably mounted in themandrel 10 is a sleeve 15 having secured to its inner end by a threaded connection a split sleeve portion 16 having a conical-shaped outer surface to conform to the conical shape of the inner end 10 of the mandrel. The conical-shaped portion of this split sleeve is provided with a series of 'collets 17 of a shape to conform to the stock, which in the present case is of hexagonal form and is represented by S. Secured to the outer end of the mandrel is a collar 18 (Figs. 15 and 16 for detail). Slidably mounted upon the sleeve 15, but keyed thereto, is another collar 19 (Figs. 17 and 18 for detail). Slidably mounted upon the mandrel is a third collar 20 having an extended cone-shaped surface 21. As shown in Figs. 17 and 18, the collar 19 has two projecting lugs 19 and to these lugs are pivoted by pins 22 a pair of dogs 23. As shown in Figs. 15 and 16, the collar 18 has forwardly extending projections 18, and these projections lie in the same plane as the noses 23 of the dogs; the tails 23 of the dogs lying in the path of the cone-shaped surface 21. Two nuts 24 and 25, one a lock for the segments 30*. One of the arms 30 is other, are threaded upon the outer end of the sleeve 15. The collar 20 is peripherally vided with a .cam roller 31- which is located in a camway of a cam 32 secured to a shaft 33. This shaft 33 is arranged in line with cesses 19, as indicated in dotted lines in Fig.

13. Extending through the perforations 18 of the ears 18 and threaded into the openings 19 of the ears 19"- are rods 34. Interposed between the ears 18 and nuts 35 on these rods are coil springs 36, these springs 36 tending to cause the collar 19 to approach the collar 18. p

In operation, assuming the parts to be in tightened position as shown in Fig. 12, the

first movement of the cam 32 slides the collar 20 rearwardly and releases the dogs 23 from the cam surface 21. The dogs are then free to swing upon the pins 22 and the springs 36 will draw the collar 19 rearwardly from the nut 25, causing the collets to release the stock after which the cone 21 will be moved forwardly causing the beveled portion thereof to swing the tails of the dogs outwardly. The noses 23* of the dogs, contacting the projections 18 of the collar 18, will force the collar' 19, and, through the nut25, likewise the collet sleeve 15, forwardly and thus tighten the collets upon the stock.

The mandrel 10 is rotated from the drive shaft 5 through the gear 37 suitably connected to the mandrel and pinion 38 on the shaft 5. Nuts 39 and 40, one a lock for the other, serve to hold the gear 37 in position. To take up end thrust on the mandrel, there are provided two thrust collars 41 and 42 with interposed anti-friction balls 43 loosely mounted on a bushing on the mandrel and held in position by the nuts 44 and 45, one being a lock for the other.

By the arrangement described, the grippingtubes, due to the action of the springs,

will be caused to readily release the bars of stock when the dogs are free from the cones;

further, in tightening the collets upon. the work, the frictional engagement of the cones with the dogs is such as to facilitate the gripping action by tending to force the dog sleeve forwardly against t e nuts 24 and 25;

and, further, by the arrangement of the sliding dog collars and the nuts 24 and 25,

which act as abutments therefor, a strong connection between the dogs and gripping tubes is had. 1

Stock feeding devices, (Figs l, 2, 7 and 12.)

During the interval between the releasing and the locking of the collets 17 upon the stock, the stock is fed rearwardly to place a new portion thereof in operative relation with the drilling and cutting tools. Slidably mounted in the collet tube 15 is a feed tube 46. The rear endof the feed tube has secured thereto by a threaded connection an auxiliary split tube portion or feed finger 47 of resilient metal having its extreme inner end shaped to conform to the contour of the stock. Threaded to the other end of the tube 46 is a collar 48 grooved to receive a ring 49. Slidably mounted on arod 50 secured to the head 3 and projecting forwardly therefrom is a hub orsleeve 51 provided with a plurality of yoke-shaped extensions 52, one for each feed tube. The bifurcated, portion of eachoof these extensions embraces a rim 49 and have studs 53 threaded therein W ich project loosely into recesses in the rings. The hub 51 has a groove 54 (Fig. 12) within which extend pins on the yoke-shaped upper end of an arm 55 (Figs. 1 and 7) on a rock-shaft 55 7 end thereof a downwardly extending arm 55 having pivotally connected therewith a link 56, the other end of which has an adjustable connection through a bolt 57 with a slotted curved arm 59 secured to a rock shaft 60 rotatably mounted in the bed frame 1. Also "secured to the rock shaft is another arm 61 having a cam roll 62 which operates in the cam groove of the cam 32. So soon as the collets 17 have been released from the stock in the manner heretoforedescribed the cam groove of the cam 32 will through the connections described, slide the sleeve 51 and hence all the feed tubes 46 so as to feed all of the bars of stockrearwardly by reason of the impingement of the flexible feed fin or or tube section 47 upon the stock, furt er movement of the cam returning the feed tubes totheir normal position.

In order to insure feeding the bars of stock a uniform distance at each feeding operation, there are provided a plurality of stops 170 (Figs. 1, 2, 6 and 21) one for each bar of stock. Each of these stops 17 0 is adjustably secured by the headed screw :17! to justment.

an arm 172 on a sleefi 173; the armvhaving a slotted opening 172 to provide for the ad- The sleeve, 173 is split and is mounted upon a stud 174 projecting from the head 3, the sleeve having ears 17 5- to receive a bolt 176 by which it is clamped to the stud, and a nut 177 threaded on a reduced end portion of the stud provides for securing the proper longitudinal .adj ustment of the sleeve. The lower end of the stop is formed with a notch, 170 as shown in Fig. 6, to accommodate the adjacent drill. The stops will be set for the proper thickness of the nuts and the adjustment of the devices which operatethe feed tubes will be such as to insure the stock being fed against the stops, any additional movement of the feed The rock-shaft has at one;

tubes being compensated for by of the tube fingers upon the stock.

By the arrangement of feed described, the feed tubes are not only withdrawn but moved in the feedin'gdirection in a positive manner, and, further, by the construction of feed fingers,in connection with the stops, the

stock is insured a definite length ofzfeed as to exert suflicient friction to bring the parts at rest as soon as the shaft 33 is disconnected from the shaft 7 in the manner hereinafter explained;

Stock drilling devices.

In the present machine there is provided four drills, one of which is shown in detail in Fig. 21. All of these drills are carried by the head 4, which slides in ways on the bed frame so as to cause the drills to be gradually fed into the stock and withdrawn therefrom. The head is reciprocated in the following manner, (Figs. 1, 2 and 29) An arm 65 is connected to a rock-shaft 66, provided with an arm 66 with its upper end connected to the head 4 by the links 67 The lower end of the arm 65 is provided with a slot 68 in which is secured an adjustable wrist pin 69, which extends into a slotted opening in an arm 69 on a shaft 69", which has an arm 69, provided with a cam roller 69 which cotiperateswith the cam 71 to reciprocate the arm; the cam being so formed that the drills will be gradually fed into the stock but quickly withdrawn therefrom by the action of a spring 69 connected to the arm 69" on the shaft 69 when the drilling operation is completed. The cam is rotated (see Fig. 1) at a slow speed from the shaft 7 through the medium of the pinion 72, fast on the shaft 7, gear 73 secured to the sleeve 74 loose on a counter-shaft 75, gear 76 integral with the sleeve 74, gear 77 connected with sleeve 78 loose on the shaft 7, pinion 79 connected with the sleeve 78, gear 80 secured to the shaft 7 5, pinion 81 secured to the shaft 75, and gear 82, having connected therewith the cam 71.

Referring now to Fig. 21, 83 represents the drill spindle having a tapered forward end, the tapered end of the spindle being mounted in the tapered bushing 84 and the rear end of the spindle in a bushing 85 in bearings formed in the head 4. The spindle is driven from the main shaft 5 through the -medium of a ear 86 on said shaft, interthe slippage i mediate gear 87, and gear 88 on the spindle;

theintermediate gear 87 shown being one of two intermediate gears which transmit the motion from the drive shaft to all four of the s indles. The gear 88 is splined to the spin 1e and held in position by the nuts .89 t

Located inthe spindle and splined thereto is the holder 93 for the dril 94; the forward end of the spindle having a guide or su port 95 for the drill.

rovision is made for adjusting the drill holder in the spindle- Threaded on the rear end of the spindle is a housing 96 (Figs. 26 and 27) having an oblong rear opening 97. Threaded in the tool holder 93 is a screw 98 having a plain cylindrical portion 99 and an 'integra collar 100, as well as a threaded rear end portion 101.. 102 (Figs. 22 and 23) represents an oblong shaped collar of a size which will ermit it to enter the oblong openin .97 o the housing 96, and also having, a orwardly-extending cylindrical boss 103 .which enters the end of the I spindle. 104 (Figs. 24 and 25) is'a circular collar having an oblong boss 104 corresponding to the oblong opening 97 of the;

collar 96. The collar 102 1s provided with a small opening 105 and the collar 104 with a projecting pin 106. In assembling the parts, the housing 96 is threaded on the end of the spindle and the collars 102 and 104 placed upon the c lindrical portion 99 of the screw before the tool holder and drill have been inserted.- When the tool holder is inserted in the mandrel the collar 102 is caused to register with the oblong opening 109 so as to enter, the housing, after which it may be given a quarter turn by means of the collar 104 and its pin 106 which has been inserted in the openin 105. The pro jecti-ng boss 104' of the co lar 104 is then pushed into the oblong opening 97 and a nut 107 threaded on the threads 101 is turned tightly against the collar 104 to hold the parts firmly clamped together.

B this construction, the drill and its holdi ar may be quickly and readily removed by simply unloosening the nut 107, withdrawing the boss 105 from the opening 97 and then giving the collar 102 a quarter turn to cause it to register with the opening 97. a

Stock severing devices, (Figs. 1, 2, 6, 12

and 21:.) Journaled upon the shaft 5 is a sleeve 110 (Figs. 12 and 21), one end .of which extends into a bearing in the frame 1.

This sleeve has an integrally-formed cone 111 and a removable'cone 112 held in position by the nuts 113. Clamped' between the cones is the hub 114 of a tool carrier, the hub having four radially-extending arms 115 to which are clam ed the cutting tools 116. The holder also as an arm 117 which is pivotally-connected by an adjustable link 118 with a crhnk'arm 120, secured to a rock shaft 121. The rock shaft 121 extends rearwardly and has a crank arm 122 pivotally-connected to one end of a cam lever 123, the other end of the cam lever being pivotally-connected to one arm of a pression 128 it will be quickly withdrawn so as to clear the tools from the path of the bars of stock as they are fed in the manner before described.

Devices for preventing feed of stock until after withdrawal of cutting tools.

The parts are so timed-that the operation of drilling and the withdrawal of the drills from the stock has been completed before the completion of the cutting operation.

In order to insure the complete withdrawal of the cutting tools prior to the beginning of the feeding operation, there is provlded' means for throwing the shaft 33, which carries the stock feeding cam, into operative relation with the shaft 7 through the clutch member 131 having a housing 132 which overhangs the ratchet teeth 130 and is preferably closed by a cover 133. The

housing 132 is cut away as indicated at 134 and in this cut-away portion and pivotally connected to the houslng is a paw 135 normally spring-pressed toward engaging position with the ratchet teeth by a flat spring 136. Extending laterally from the pawl 135 and through an opening 137 in the housing is a finger 138. Thls finger is normally held out of en agement with the ratchet-teeth by the big part of a cam 139, slidably mounted upon the hub of the clutch member 131. Secured to the hub of the cam by set-screws 140 is a ring 141 having projecting pins 142 which extend loosely into nected to a rod 147, the other end of which' is pivoted to an arm 148 of a bell crank lever, 150 representing the other arm thereof, pivoted on the pin 149 carried by the bracket. 149 see Figs. 3 and 5). A coil spring 151- isplaced about the rod 147 and interposed between a projection 152 onthe frame of the machine and a collar 153 on the rod, Pivot ally-connected to-a bracket 154' on the latch in the form of a bell crank lever, 155 and 156 representing the respective armsv thereof; the arm 156 having a shoulder 157 formed by anextended face portion 158 at the extreme end thereof.

Carried by the bifurcated lever 123 is a.

pin 159 normally spring-pressed by a coil spring 160 into engagement with the arm 156 of the latch. An adjustable screw 161 in an extension of theframe forms a stop for the latch. The operation is as follows I a Assuming the clutch members to be in the position shown in Figs. 3 and 11, the cam 139 is holding the pawl 135 out of enga ement with the clutch member 129 and t e cam roller 127 on the lever 123 is about to drop into the recess 128 as shown in Fig.

6. When the cam rolldrops into the recess .the lever 123 will be given a rapid movement to the right which, by reason of the engagement of the arm 150 with the shoulder of the latch'will rock the bell crank lever and cause the rod 147 to withdraw the cam 139 from beneath the finger 138, thus permitting the pawl to engage the clutch member 129 so as to impart rotary movement to the shaft 33 and hence cause the cam to operate the feeding devices. Continued movement of the lever 123 will cause 161 and thus release the arm 150 from the latch, whereupon the spring 151 will throw the cam 139 back into the path of the finger 13 8, this being permitted because of the fact that the low portion of the cam is now 00- inciding with the finger. The finger, riding upon the high portion of the cam will disengage the pawl from the ratchet wheel 129 so that the movement of the shaft 33 will be arrested. The cam 128 is now moving the arm 123 and its latch to the left in Fig. 6, the end of the finger 150 will ride over the face 15 0f the trip, and the trip under action of the spring 160, will again swing back to the position shown in Fig. 3 so that upon the return movementof the lever 123 to the right it will again engage the arm 150 and operate it in the manner before described.

While there has been shown and described a machine which is especially adapted for blfurcated lever 123 is a the forming of nut blanks, yet some of the constructions are equally applicable to other forms of metal working machines and I do not desire, therefore, to be limited to a machine of the exact character described.

' Having thus described my invention, I claim 1. In a machine of the character described, a fplurality of feeding devices for a plurality 0 bars of stock, one set of feeding devices being associated with each bar of stock,a plurality of tools, one set being associated shaft centrally located with reference to the tools, an auxiliary supporting shaft similarl located with referenceto thefeeding devices, the said shafts being substantially in alinement, and an actuating device comating device being operated by the main operating shaft and belng supported upon said auxiliary shaft.

2. In amachine of the character described, a lurality of feeding devices for a plurality of bars of stock, a plurality of tools for said bars of stock, -a sliding head for supporting said tools, an auxiliary supporting shaft for the feeding devices and a main operating shaft, the last two -mentioned shafts being centrally located in relation to the toolsand feeding devices, a main cam shaft below the main operating shaft, and an auxiliary cam shaft intermittently oper- "ated by the main cam shaft, onecam shaft being connected to the feeding devices and ifsihel other to the tools, for the purpose specistock feeding devices, forming devices for said stock, mechanism for positively feedin the forming devices'into the stock, weighted connections for withdrawing-said forming devices, continuously operated driving devices, and means operated by said weighted connections for throwing said driving de vices into operative relation with said stock feeding devices.

4. In a machine of the character described,

stock feeding devices, forming devices for 115 mon to all of said feeding devices, said actu with each bar of stock, a main operating 3. In a machine of the character described, I

mechanism controlled by said operating deing said cutting shaft, stock vice for operating said stock feeding devices.

6. In a machine of the character described, stock feeding device's, cutting devices for said stock, a cam for feeding said cutting devices into the stock, an operating device controlled by said cam together with connections for withdrawing said cutting devices from the stock, a continuously operating shaft, and mechanism controlled by said operating devices connections for throwing said shaft into operative relation with said stock feeding devices, together with means for disconnecting the same therefrom after a predetermined movement of said feeding devices. a

7. In a machine of the character described, stock feeding devices including a driven shaft, stock cuttin devices, a cam for feedevices into the stock, an operating device controlled by said cam together with connections for withdrawing said cutting devices from the stock, a continuously operating driving shaft, and mechanism including a clutch controlled by said operating device for throwing said shafts in drivingrelation with each other, together with means for disconnecting the same after a predetermined movement of said driven shaft.

8. In a machine of the character described, stock feedin devices including a driven farming devices, mechanism for feeding said forming devices into the stock and withdrawing the same therefrom, a drivin shaft, clutch members on the respective s afts including a pawl and ratchet wheel, acam for normally holding the pawl out of engagement with said ratchet wheel, and devices operated by the withdrawing mechanism for said forming devices for causing said cam to release said pawl and engage said ratchet wheel, and a spring for returning said cam to operative position relative to said pawl. I

9. In a machine of the character described, a plurality of feeding devices for a lurality of bars of stockTa plurality of too s, each,

tool being arranged to register with a bar of stock, a main operatin shaft and a supporting shaft substantia ly centrally located with reference to the tools and feeding devices, a main cam shaft, an auxiliary cam shaft intermittently operated by the main cam shaft, an actuator for the feeding devices supported by said supporting shaft, connections between the auxiliary cam shaft for operating said actuator, and means connecting the tools to the main operating shaft, for the purpose specified.

10. In a machine of the character described, a plurality of feeding devices for a plurality of bars of stock, a sliding head, a plurality of tools supported by said head,

a main operating shaft centrally located in its relation to said tools, means connecting same with said tools, an auxiliary supporting shaft in substantial alinement with the main operating shaft, a main cam shaft below the operating shaft, an actuator common to all said feeding devices on said supporting'shaft, an auxiliary cam shaft located below said supporting shaft, means connecting the main operating shaft with said cam shaft, and means connecting the actuator with said cam shaft, for the purpose s cified.

11. n a machine of the character described, a plurality of stock holding devices, a movable severing tool support common to all of said devices, severing tools carried by said support, one associated with each of said holding devices, and mechanism for positively rocking said tool support to feed said tools simultaneously into the stock, together with means for withdrawing the same therefrom.

12. In a machine of' the character described, a plurality of stock holding devices, an oscillatory tool support common to all of said devices, a plurality oftools mounted upon said support, one of said tools associated with one ofsaid holding devices, a cam for oscillating said support in one direction to simultaneously feed all of said tools into the stock, and means for oscillating said support in the opposite direction to simultaneously withdraw all of said tools from the stock.

13. In a machine of the character described, a support, a spindle revolubly mounted in said support, a tool holder refixed to the end of said spindle having an .oblong opening, a collar loosely connected with said tool holder ofan oblong shape conforming to said oblong o ening, a second collar loosely connected wit said tool holder having .a loose rotatable connection with said oblong collar so as to turn the same relatively to said housing to form an interlocking connection, and means for locking said second mentioned collar.

14. In a device of the character described, a support, a spindle rotatably mounted in said support, a tool holder removably mounted in said spindle but rotatable therewith, a tool carried by said holder, an adjusting screw threaded in said holder, a housing connected with the end of said spindle having an oblong opening, a .collar loosely mounted on said screw of an oblong shape to enter said opening, a fixed collar on said screw adjacent said oblong collar, and means for turning said oblong collar in said opening to form an interlocking connection between said collar and housing.

15. In a machine of the character described, a support, a spindle rotatably mounted in said support, a tool holder rebetween said toolholder and said oblong' movably mounted in said s indle but rotncollar. 10 table therewith, a hous' ed to the end- In testimony whereof I have hereunto set of said spindle provid with an oblong my hand this 18th day of December, 1919.

opening, a collar of an oblong form to enter WILLIAM HOY BRADLEY.

- said opening, means for turmng said collar in said housing to form an interlocking con- Witness: nection between the two, and an abutment Cm. 1. Wm. 

